Sparking plug.



No. 68|,977. Patented Sont. 3, |90I. l.' RICARD l F. C. GABY.

SPARKUIG PLUS.

(Anuman am nu. 1n, 1001.)

(lo lodol.)

UNITED STATES PATENT OEEICE.

JEAN MARIE RICARD AND FRANCOIS CLMENT GARY, OF TOULOUSE,- FRANCE.

SPARKING PLUG.

SPECIFICATION forming part of Letters Patent No. 681,977', dated September 3, 1901.

Application led March 15, 1901. Serial No. 51,223. (No model.)

To lf/ZZ whom t may concern:

Beit known that we, JEAN MARIE RICARD and FEANQoIs CLMENT GARY, engineers, of 19 Rue du Taur, Toulouse, in the Republic of France, have invented Improvements in Spar-king Plugs, of which the following is a specification.

This invention relates to sparking plugs, and in order that our invention may be readily understood and carried into effect We Will describe the same fully with reference to the accompanyingl drawings, in which- Figure l is an external View of a sparking plug embodying our invention, and Fig. 2 is a longitudinal section of the same.

As shown, our improved sparking plug is provided with a centrallydisposed rod t, which is formed with a screw-threaded portion at one end and with a collar or shoulder 1- at the other end. The said rod tis engaged in the cylindre-conical sleeve M, made of porcelain or other suitable material. The conical portion of the sleeve M fits exactly into a tapered seat Within the metal socket D and flush with the screw end thereof. Ve also provide a porcelain ring D, having a reduced end in engagement with the socket D and surrounding the free end of the sleeve M. The rod if, sleeve M, and ring D are maintained in a concentrical position by means of a centering-Washer f, of suitable material, which is formed with a flange f', engaging between the ring D and the sleeve M. The hole or opening for the rod i being perfectly of the collar or shoulder r forces the conical 4o portion of the sleeve into the conical seat of the socket and locks the parts f', D', and D firmly together.

Having now particularly described and ascertained the nature of oursaid invention and in what manner the same is to be performed, We declare that what We claim is A sparking plug comprising a socket, hav# ing a conical seat formed within itsbore, a non-conducting ring, one end of which telescopes with the adjacent end of the socket, a sleeve having one end fitted to the conical seat in the bore of the socket, a rod extending through the sleeve, said rod having a collar or shoulder on one end and acentering-washer embracing adjacent ends of the ring,sleeve and rod whereby to hold them concentric and out of contact with one another, and means on the rod by Which parts of the plug are held together.

In testimony that We claim the foregoing We have hereunto set our hands.

JEAN MARIE RICARD. FRANCOIS CLEMENT GARY. Witnesses:

JOSEPH MATEAY, EDMOND LECOUTWEIEE. 

